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tty: Add lock/unlock ldisc pair functions
Just as the tty pair must be locked in a stable sequence (ie, independent of which is consider the 'other' tty), so must the ldisc pair be locked in a stable sequence as well. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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